G70.81
BillableLambert-Eaton syndrome in disease classified elsewhere
HCC Category Mapping
V28HCC 196 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre
0.402V24HCC 75 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome
0.425ESRDHCC 75 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome
0.000RxHCCHCC 153 — Myasthenia Gravis/Myoneural Conditions
0.000What This Code Means
Lambert-Eaton syndrome occurring as a complication of another disease, most commonly small cell lung cancer or other malignancies.
Coding Tips
- •This code requires documentation of the underlying disease; code the associated condition separately
- •Commonly associated with malignant neoplasms; ensure both conditions are coded
Clinical Significance
Lambert-Eaton syndrome in disease classified elsewhere is a manifestation code indicating that the neuromuscular disorder is secondary to another classified condition, most commonly malignancy. Capturing both the Lambert-Eaton syndrome and its underlying cause provides a comprehensive picture of the patient's disease burden and care requirements. This dual-code situation often yields substantial combined RAF impact.
Documentation Requirements
- ✓Documentation of the underlying disease causing the Lambert-Eaton syndrome
- ✓The underlying disease code must be sequenced first (etiology-manifestation convention)
- ✓Clinical features of Lambert-Eaton syndrome: proximal weakness, autonomic dysfunction
- ✓Electrodiagnostic or antibody testing confirming Lambert-Eaton syndrome
- ✓Treatment plan addressing both the underlying disease and the Lambert-Eaton syndrome
- ✓Provider's explicit documentation linking the Lambert-Eaton syndrome to the underlying condition
Excludes 1 — Do NOT code together
- Lambert-Eaton syndrome in neoplastic disease (G73.1)
Code First
- underlying disease
Commonly Confused Codes
G70.80 — Lambert-Eaton syndrome, unspecified should be used when no underlying disease is identifiedG73.1 — Lambert-Eaton syndrome in neoplastic disease is specifically for cancer-associated cases and is also a manifestation codeG70.00 — Myasthenia gravis is a different neuromuscular junction disorder with postsynaptic pathologyG73.3 — Myasthenic syndromes in other diseases is for myasthenic (not Lambert-Eaton) symptoms secondary to other diseases
Code Hierarchy
└G70Myasthenia gravis and other myoneural disorders└G70.8Other specified myoneural disorders└G70.81Lambert-Eaton syndrome in disease classified elsewhere
└G70.81Lambert-Eaton syndrome in disease classified elsewhere